Rename webapp_it2me to remoting_webapp and move it from webapp/me2mom to webapp/

remoting/webapp/me2mom/oauth2.js

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * @fileoverview
- * OAuth2 class that handles retrieval/storage of an OAuth2 token.
- *
- * Uses a content script to trampoline the OAuth redirect page back into the
- * extension context.  This works around the lack of native support for
- * chrome-extensions in OAuth2.
- */
-
-'use strict';
-
-/** @suppress {duplicate} */
-var remoting = remoting || {};
-
-/** @type {remoting.OAuth2} */
-remoting.oauth2 = null;
-
-
-/** @constructor */
-remoting.OAuth2 = function() {
-};
-
-// Constants representing keys used for storing persistent state.
-/** @private */
-remoting.OAuth2.prototype.KEY_REFRESH_TOKEN_ = 'oauth2-refresh-token';
-/** @private */
-remoting.OAuth2.prototype.KEY_ACCESS_TOKEN_ = 'oauth2-access-token';
-/** @private */
-remoting.OAuth2.prototype.KEY_EMAIL_ = 'remoting-email';
-
-// Constants for parameters used in retrieving the OAuth2 credentials.
-/** @private */
-remoting.OAuth2.prototype.CLIENT_ID_ =
-      '440925447803-2pi3v45bff6tp1rde2f7q6lgbor3o5uj.' +
-      'apps.googleusercontent.com';
-/** @private */
-remoting.OAuth2.prototype.CLIENT_SECRET_ = 'W2ieEsG-R1gIA4MMurGrgMc_';
-/** @private */
-remoting.OAuth2.prototype.SCOPE_ =
-      'https://www.googleapis.com/auth/chromoting ' +
-      'https://www.googleapis.com/auth/googletalk ' +
-      'https://www.googleapis.com/auth/userinfo#email';
-/** @private */
-remoting.OAuth2.prototype.REDIRECT_URI_ =
-      'https://talkgadget.google.com/talkgadget/blank';
-/** @private */
-remoting.OAuth2.prototype.OAUTH2_TOKEN_ENDPOINT_ =
-    'https://accounts.google.com/o/oauth2/token';
-
-/** @return {boolean} True if the app is already authenticated. */
-remoting.OAuth2.prototype.isAuthenticated = function() {
-  if (this.getRefreshToken()) {
-    return true;
-  }
-  return false;
-};
-
-/**
- * Removes all storage, and effectively unauthenticates the user.
- *
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.clear = function() {
-  window.localStorage.removeItem(this.KEY_REFRESH_TOKEN_);
-  window.localStorage.removeItem(this.KEY_EMAIL_);
-  this.clearAccessToken();
-};
-
-/**
- * @param {string} token The new refresh token.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.setRefreshToken = function(token) {
-  window.localStorage.setItem(this.KEY_REFRESH_TOKEN_, escape(token));
-  this.clearAccessToken();
-};
-
-/** @return {?string} The refresh token, if authenticated, or NULL. */
-remoting.OAuth2.prototype.getRefreshToken = function() {
-  var value = window.localStorage.getItem(this.KEY_REFRESH_TOKEN_);
-  if (typeof value == 'string') {
-    return unescape(value);
-  }
-  return null;
-};
-
-/**
- * @param {string} token The new access token.
- * @param {number} expiration Expiration time in milliseconds since epoch.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.setAccessToken = function(token, expiration) {
-  var access_token = {'token': token, 'expiration': expiration};
-  window.localStorage.setItem(this.KEY_ACCESS_TOKEN_,
-                              JSON.stringify(access_token));
-};
-
-/**
- * Returns the current access token, setting it to a invalid value if none
- * existed before.
- *
- * @private
- * @return {{token: string, expiration: number}} The current access token, or
- * an invalid token if not authenticated.
- */
-remoting.OAuth2.prototype.getAccessTokenInternal_ = function() {
-  if (!window.localStorage.getItem(this.KEY_ACCESS_TOKEN_)) {
-    // Always be able to return structured data.
-    this.setAccessToken('', 0);
-  }
-  var accessToken = window.localStorage.getItem(this.KEY_ACCESS_TOKEN_);
-  if (typeof accessToken == 'string') {
-    var result = JSON.parse(accessToken);
-    if ('token' in result && 'expiration' in result) {
-      return /** @type {{token: string, expiration: number}} */ result;
-    }
-  }
-  console.log('Invalid access token stored.');
-  return {'token': '', 'expiration': 0};
-};
-
-/**
- * Returns true if the access token is expired, or otherwise invalid.
- *
- * Will throw if !isAuthenticated().
- *
- * @return {boolean} True if a new access token is needed.
- */
-remoting.OAuth2.prototype.needsNewAccessToken = function() {
-  if (!this.isAuthenticated()) {
-    throw 'Not Authenticated.';
-  }
-  var access_token = this.getAccessTokenInternal_();
-  if (!access_token['token']) {
-    return true;
-  }
-  if (Date.now() > access_token['expiration']) {
-    return true;
-  }
-  return false;
-};
-
-/**
- * Returns the current access token.
- *
- * Will throw if !isAuthenticated() or needsNewAccessToken().
- *
- * @return {string} The access token.
- */
-remoting.OAuth2.prototype.getAccessToken = function() {
-  if (this.needsNewAccessToken()) {
-    throw 'Access Token expired.';
-  }
-  return this.getAccessTokenInternal_()['token'];
-};
-
-/** @return {void} Nothing. */
-remoting.OAuth2.prototype.clearAccessToken = function() {
-  window.localStorage.removeItem(this.KEY_ACCESS_TOKEN_);
-};
-
-/**
- * Update state based on token response from the OAuth2 /token endpoint.
- *
- * @private
- * @param {XMLHttpRequest} xhr The XHR object for this request.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.processTokenResponse_ = function(xhr) {
-  if (xhr.status == 200) {
-    var tokens = JSON.parse(xhr.responseText);
-    if ('refresh_token' in tokens) {
-      this.setRefreshToken(tokens['refresh_token']);
-    }
-
-    // Offset by 120 seconds so that we can guarantee that the token
-    // we return will be valid for at least 2 minutes.
-    // If the access token is to be useful, this object must make some
-    // guarantee as to how long the token will be valid for.
-    // The choice of 2 minutes is arbitrary, but that length of time
-    // is part of the contract satisfied by callWithToken().
-    // Offset by a further 30 seconds to account for RTT issues.
-    this.setAccessToken(tokens['access_token'],
-        (tokens['expires_in'] - (120 + 30)) * 1000 + Date.now());
-  } else {
-    console.log('Failed to get tokens. Status: ' + xhr.status +
-                ' response: ' + xhr.responseText);
-  }
-};
-
-/**
- * Asynchronously retrieves a new access token from the server.
- *
- * Will throw if !isAuthenticated().
- *
- * @param {function(XMLHttpRequest): void} onDone Callback to invoke on
- *     completion.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.refreshAccessToken = function(onDone) {
-  if (!this.isAuthenticated()) {
-    throw 'Not Authenticated.';
-  }
-
-  var parameters = {
-    'client_id': this.CLIENT_ID_,
-    'client_secret': this.CLIENT_SECRET_,
-    'refresh_token': this.getRefreshToken(),
-    'grant_type': 'refresh_token'
-  };
-
-  /** @type {remoting.OAuth2} */
-  var that = this;
-  /** @param {XMLHttpRequest} xhr The XHR reply. */
-  var processTokenResponse = function(xhr) {
-    that.processTokenResponse_(xhr);
-    onDone(xhr);
-  };
-  remoting.xhr.post(this.OAUTH2_TOKEN_ENDPOINT_,
-                    processTokenResponse,
-                    parameters);
-};
-
-/**
- * Redirect page to get a new OAuth2 Refresh Token.
- *
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.doAuthRedirect = function() {
-  var GET_CODE_URL = 'https://accounts.google.com/o/oauth2/auth?' +
-    remoting.xhr.urlencodeParamHash({
-          'client_id': this.CLIENT_ID_,
-          'redirect_uri': this.REDIRECT_URI_,
-          'scope': this.SCOPE_,
-          'response_type': 'code',
-          'access_type': 'offline',
-          'approval_prompt': 'force'
-        });
-  window.location.replace(GET_CODE_URL);
-};
-
-/**
- * Asynchronously exchanges an authorization code for a refresh token.
- *
- * @param {string} code The new refresh token.
- * @param {function(XMLHttpRequest):void} onDone Callback to invoke on
- *     completion.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.exchangeCodeForToken = function(code, onDone) {
-  var parameters = {
-    'client_id': this.CLIENT_ID_,
-    'client_secret': this.CLIENT_SECRET_,
-    'redirect_uri': this.REDIRECT_URI_,
-    'code': code,
-    'grant_type': 'authorization_code'
-  };
-
-  /** @type {remoting.OAuth2} */
-  var that = this;
-  /** @param {XMLHttpRequest} xhr The XHR reply. */
-  var processTokenResponse = function(xhr) {
-    that.processTokenResponse_(xhr);
-    onDone(xhr);
-  };
-  remoting.xhr.post(this.OAUTH2_TOKEN_ENDPOINT_,
-                    processTokenResponse,
-                    parameters);
-};
-
-/**
- * Call myfunc with an access token as the only parameter.
- *
- * This will refresh the access token if necessary.  If the access token
- * cannot be refreshed, an error is thrown.
- *
- * The access token will remain valid for at least 2 minutes.
- *
- * @param {function(string):void} myfunc
- *        Function to invoke with access token.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.callWithToken = function(myfunc) {
-  /** @type {remoting.OAuth2} */
-  var that = this;
-  if (remoting.oauth2.needsNewAccessToken()) {
-    remoting.oauth2.refreshAccessToken(function() {
-      if (remoting.oauth2.needsNewAccessToken()) {
-        // If we still need it, we're going to infinite loop.
-        throw 'Unable to get access token.';
-      }
-      myfunc(that.getAccessToken());
-    });
-    return;
-  }
-
-  myfunc(this.getAccessToken());
-};
-
-/**
- * Get the user's email address.
- *
- * @param {function(?string):void} setEmail Callback invoked when the email
- *     address is available, or on error.
- * @return {void} Nothing.
- */
-remoting.OAuth2.prototype.getEmail = function(setEmail) {
-  /** @type {remoting.OAuth2} */
-  var that = this;
-  /** @param {XMLHttpRequest} xhr The XHR response. */
-  var onResponse = function(xhr) {
-    that.email = null;
-    if (xhr.status == 200) {
-      // TODO(ajwong): See if we can't find a JSON endpoint.
-      that.email = xhr.responseText.split('&')[0].split('=')[1];
-    }
-    window.localStorage.setItem(that.KEY_EMAIL_, that.email);
-    setEmail(that.email);
-  };
-
-  /** @param {string} token The access token. */
-  var getEmailFromToken = function(token) {
-    var headers = { 'Authorization': 'OAuth ' + token };
-    // TODO(ajwong): Update to new v2 API.
-    remoting.xhr.get('https://www.googleapis.com/userinfo/email',
-                     onResponse, '', headers);
-  };
-
-  this.callWithToken(getEmailFromToken);
-};
-
-/**
- * If the user's email address is cached, return it, otherwise return null.
- *
- * @return {?string} The email address, if it has been cached by a previous call
- *     to getEmail, otherwise null.
- */
-remoting.OAuth2.prototype.getCachedEmail = function() {
-  var value = window.localStorage.getItem(this.KEY_EMAIL_);
-  if (typeof value == 'string') {
-    return value;
-  }
-  return null;
-};